AZ91D镁合金和2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为研究

刘泽琪, 何潇潇, 祁康, 黄华良

Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution

LIU Zeqi, HE Xiaoxiao, QI Kang, HUANG Hualiang

表2 未耦合和耦合后再断开条件下AZ91D镁合金与2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h的EIS拟合结果

Table 2 EIS fitting parameters of AZ91D Mg-alloy and 2002 Al-alloy immersion in 0.5 mg/L NaCl solution at 30 ℃ for 24 h under the conditions of uncoupling and coupling

Material	Condition	R_s Ω·cm²	C_f1 F·cm^-2	R_f1 Ω·cm²	CPE_f2 S·s^nf1·cm^-2	n_f2	R_f2 Ω·cm²	CPE_dl S·s^nf2·cm^-2	n_dl	R_ct Ω·cm²	R_p Ω·cm²
Mg-alloy	Uncoupling	124.37	---	---	8.27×10^-8	0.93	30130	1.38×10^-5	0.86	16915	47045
Mg-alloy	Coupling	94.86	---	---	6.59×10^-8	0.97	12928	1.40×10^-5	0.75	10431	23359
Al-alloy	Uncoupling	68.30	2.86×10^-7	12840	1.31×10^-7	0.92	2514	5.05×10^-5	0.78	609454	624808
Al-alloy	Coupling	24.56	1.10×10^-8	1717	4.48×10^-5	0.89	3313	3.87×10^-4	0.78	24970	30000